M166 datasheet(59/127 Pages) SIEMENS

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30Mar98@15:00h

Semiconductor Group

Version 1.2, 12.97

C166 Family Instruction Set

Instruction Description

CMPI2

Integer Compare and Increment by 2

CMPI2

Syntax

CMPI2

op1, op2

Operation

(op1)

⇔ (op2)

(op1)

← (op1) + 2

Data Types

WORD

Description

This instruction is used to enhance the performance and flexibility of

loops. The source operand specified by op1 is compared to the source

operand specified by op2 by performing a 2’s complement binary subtrac-

tion of op2 from op1. Operand op1 may specify ONLY GPR registers.

Once the subtraction has completed, the operand op1 is incremented by

two. Using the set flags, a branch instruction can then be used in conjunc-

tion with this instruction to form common high level language FOR loops of

any range.

E Set if the value of op2 represents the lowest possible negative number.

Cleared otherwise. Used to signal the end of a table.

Z Set if result equals zero. Cleared otherwise.

V Set if an arithmetic underflow occurred, ie. the result cannot be repre-

sented in the specified data type. Cleared otherwise.

C Set if a borrow is generated. Cleared otherwise.

N Set if the most significant bit of the result is set. Cleared otherwise.

Addressing Modes

Mnemonic

Format

Bytes

CMPI2

Rwn, #data4

90 #n

CMPI2

Rwn, #data16

96 Fn ## ##

CMPI2

Rwn, mem

92 Fn MM MM

Condition Flags

***

M166 Datasheet(PDF) 59 Page - Siemens Semiconductor Group

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